Commission Regulation (EEC) No 24/86 of 7 January 1986 re-establishing the levying of customs duties applicable to polyethylene of a density of 0,94 g/cm³ or more falling within subheading 39.02 C I ex a), originating in Saudi Arabia, to which the preferential tariff arrangements set out in Council Regulation (EEC) No 3599/85 apply